A third bolt fractured “recently” and was captured by “precautionary tethering” put in place last year, the developer said. Its tests concluded that the bolts had fractured due to a process called hydrogen embrittlement, which leads to cracks within the bolt material. British Land said it will replace a number of bolts, which are just under 1 metre long, as a precautionary measure.

The update came as the company, which built the tower with Canadian fund Oxford Properties, revealed that a further 93,400 sq ft of space has been leased. This includes the building’s architects, Rogers Stirk Harbour & Partners, who will be moving to level 14, from their current home at Thames Wharf Studios in Hammersmith.

A further five floors are also under offer in three additional transactions. This means about 70% of the total office space is let or under offer.

Other tenants include global insurance broker Aon, insurance firms Amlin and Rothesay Life and Australian serviced office provider Servcorp. Servcorp opened its offices on level 30 in December, with business information group Dun & Bradstreet the first company to move into the building.

The Cheesegrater set a new record for office rents in the City, when in October the US-based insurance company FM Global took the 41st floor at £85 per sq ft.